using System;

using System.Security.Cryptography;

using System.Text;

​

namespace EncryptDecryptPasswordCsharp

{

    class Program

    {

        static void Main(string[] args)

        {

            var text = "This is my password to protect";

​

            var encryptedText = EncryptPlainTextToCipherText(text);

            var decryptedText = DecryptCipherTextToPlainText(encryptedText);

​

​

            Console.WriteLine("Passed Text = " + text);

            Console.WriteLine("EncryptedText = " + encryptedText);

            Console.WriteLine("DecryptedText = " + decryptedText);

            Console.ReadLine();

        }

​

        //This security key should be very complex and Random for encrypting the text. This playing vital role in encrypting the text.

        private const string SecurityKey = "ComplexKeyHere_12121";

​

        //This method is used to convert the plain text to Encrypted/Un-Readable Text format.

        public static string EncryptPlainTextToCipherText(string PlainText)

        {

            // Getting the bytes of Input String.

            byte[] toEncryptedArray = UTF8Encoding.UTF8.GetBytes(PlainText);

​

            MD5CryptoServiceProvider objMD5CryptoService = new MD5CryptoServiceProvider();

            //Gettting the bytes from the Security Key and Passing it to compute the Corresponding Hash Value.

            byte[] securityKeyArray = objMD5CryptoService.ComputeHash(UTF8Encoding.UTF8.GetBytes(SecurityKey));

            //De-allocatinng the memory after doing the Job.

            objMD5CryptoService.Clear();

​

            var objTripleDESCryptoService = new TripleDESCryptoServiceProvider();

            //Assigning the Security key to the TripleDES Service Provider.

            objTripleDESCryptoService.Key = securityKeyArray;

            //Mode of the Crypto service is Electronic Code Book.

            objTripleDESCryptoService.Mode = CipherMode.ECB;

            //Padding Mode is PKCS7 if there is any extra byte is added.

            objTripleDESCryptoService.Padding = PaddingMode.PKCS7;

​

​

            var objCrytpoTransform = objTripleDESCryptoService.CreateEncryptor();

            //Transform the bytes array to resultArray

            byte[] resultArray = objCrytpoTransform.TransformFinalBlock(toEncryptedArray, 0, toEncryptedArray.Length);

            objTripleDESCryptoService.Clear();

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);

        }

​

        //This method is used to convert the Encrypted/Un-Readable Text back to readable  format.

        public static string DecryptCipherTextToPlainText(string CipherText)

        {

            byte[] toEncryptArray = Convert.FromBase64String(CipherText);

            MD5CryptoServiceProvider objMD5CryptoService = new MD5CryptoServiceProvider();

​

            //Gettting the bytes from the Security Key and Passing it to compute the Corresponding Hash Value.

            byte[] securityKeyArray = objMD5CryptoService.ComputeHash(UTF8Encoding.UTF8.GetBytes(SecurityKey));

            objMD5CryptoService.Clear();

​

            var objTripleDESCryptoService = new TripleDESCryptoServiceProvider();

            //Assigning the Security key to the TripleDES Service Provider.

            objTripleDESCryptoService.Key = securityKeyArray;

            //Mode of the Crypto service is Electronic Code Book.

            objTripleDESCryptoService.Mode = CipherMode.ECB;

            //Padding Mode is PKCS7 if there is any extra byte is added.

            objTripleDESCryptoService.Padding = PaddingMode.PKCS7;

​

            var objCrytpoTransform = objTripleDESCryptoService.CreateDecryptor();

            //Transform the bytes array to resultArray

            byte[] resultArray = objCrytpoTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            objTripleDESCryptoService.Clear();

​

            //Convert and return the decrypted data/byte into string format.

            return UTF8Encoding.UTF8.GetString(resultArray);

        }

    }       

}

​